Now set the custom message according to your requirments. See the below reference image for more better understanding
Open Your Blogger Account , Then click on layout section, see image for reference. Now you will see lots of Add a Gadget button. Choose one of them wherever u want to add contact form . Click on it and you will see contact form, choose it and save.
Login to facebook account , and follow the steps carefully and see reference image below for better understanding.
Open https://studio.youtube.com or click on settings, ( Bottom ) left side . Then , a popup will show and then click on Branding. After you have clicked , another popup box will appear like below and now you have to upload your Read More